Exenatide (Byetta ®) Regulation of Intestinal and Hepatic Lipoprotein Particle Production in Humans

Hyperlipidemia Clinical Trial

Official title:

Exenatide (Byetta ®) Regulation of Intestinal and Hepatic Lipoprotein Particle Production in Humans.

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT01056549
• Other study ID #: REB 09-0428-B
• Status: Completed
• Phase: N/A
• First received: November 12, 2009
• Last updated: June 21, 2012
• Start date: January 2010
• Est. completion date: September 2011

Study information

• Verified date: June 2012
• Source: University Health Network, Toronto
• Contact: n/a
• Is FDA regulated: No
• Health authority: Canada: Health Canada
• Study type: Interventional

Clinical Trial Summary

Exenatide acutely inhibits intestinal lipoprotein particle production. We are unable to speculate whether exenatide affects hepatic lipoprotein production in humans since there is currently no evidence from animal models or in vitro studies that have demonstrated an effect

Description:

Subjects will receive an infusion of stable isotope enriched acetate, leucine and a bolus of glycerol in order to measure the rates of fatty acid synthesis, apolipoprotein and triglyceride turnover respectively. This in vivo stable isotope enrichment methodology has been widely established and used by investigators around the world for more than 30 years to examine the metabolism of various metabolites in humans.

Following an overnight fast, at approximately 9am on day 1 of the study the subject will be admitted to hospital and will have a 30ml fasting blood sample drawn for analysis of plasma glucose, total plasma cholesterol, LDL-cholesterol, HDL cholesterol, triglycerides (TG), free fatty acids (FFA), insulin, GLP-1, growth hormone, glucagon, stable isotope enrichment and a more detailed analysis of triglyceride rich lipoprotein (TRL) composition (lipid and apolipoprotein content). A radio-opaque polyvinyl feeding tube (Entriflex NG Tube 55'' [140cm] 10fr Item # 8884721055, Kendall Products, Tyco Healthcare, Toronto, ON) will be inserted through the nose into the stomach, with enough length provided for migration of the tip into the duodenum. The subject will be administered 10 mg metoclopramide orally to facilitate transport of the tip of the tube into the duodenum. The subject will be allowed to eat regular meals during the day but will fast overnight after 7pm and will remain fasting for the duration of the study. Water ad lib will be allowed. At approximately 3pm on day 1 an abdominal X-Ray will confirm the position of the tube in the duodenum. At 4pm 2 iv's will be inserted into a superficial vein in each forearm, one for infusion and one for sampling. An infusion of 1-13C acetate (15 gm in a bag of ½ N saline at 32ml/hr) will begin after the iv's have been inserted and will be infused for the remainder of the study, which is 27 hours.

Starting at 4am a synthetic triglyceride emulsion, Intralipid (20% solution, Baxter Canada) , will be infused through the feeding tube into the duodenum at a rate of 40 ml/hr for the duration of the experiment (ie until 7pm that evening). This will provide a steady state fed state for the subsequent assessment of lipoprotein turnover kinetics.

The subjects will receive, in random order, either exenatide 10 mg or equivalent volume of saline subcutaneously at 7am on day 2 of the hospitalization (i.e. at -2hr) during the first of the two studies. The pancreatic clamp will begin at 7am (-2hr), immediately following administration of either exenatide or saline and continue throughout the subsequent 12 hours (until 7pm). . During the pancreatic clamp the subjects will receive an iv infusion of glucagon (0.65ng/kg/min), growth hormone (Humatrope, 3.0 ng/kg/min), somatostatin (sandostatin, 25 µg/hr) and insulin (Novolin R, 0.05 mU/kg/min).

At 9 am (we will refer to this time point as 0hr of the lipoprotein turnover study), the lipoprotein turnover study will begin. An iv bolus of deuterated-glycerol (d5-glycerol, 75 mmol/kg) will be administered, followed by a primed-constant infusion of deuterated leucine; d3-leucine, (10 mmol/kg bolus followed by 10 mmol/kg/hr for 10 hours). Blood samples will be collected prior to and at regular time intervals for 10 hours after the iv bolus of d3-glycerol and start of the constant infusion of d3-leucine (for assessment of lipoprotein kinetics). Blood samples will be collected prior to (30ml at -2hr, 10ml at -1hr and 30ml at 0hr) and 5min and 15min (10ml each) and then 30ml each at 30min, 1hr, 2hr, 3hr, 4hr, 5hr, 6hr (only 10ml),7hr, 8hr, 9hr and 10hr after administration of d5-glycerol and start of d3-leucine infusion.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 15
• Est. completion date: September 2011
• Est. primary completion date: September 2011
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: Both
• Age group: 18 Years to 60 Years

Eligibility

Inclusion Criteria:

1. Men and women, aged 18 to 60 years

2. Body mass index 20 kg/m2 to 25 kg/m2

3. Hemoglobin above 130g/L.

4. Normal glucose tolerance in response to a 75g, 2-hr OGTT

Exclusion Criteria:

1. Subject has a history of hepatitis/hepatic disease that has been active within the previous two years.

2. Any significant active (over the past 12 months) disease of the gastrointestinal, pulmonary, neurological, renal (Cr > 1.5 mg/dL), genitourinary, hematological systems, or has severe uncontrolled treated or untreated hypertension (sitting diastolic BP > 100 or systolic > 180) or proliferative retinopathy

3. History of diabetes or OGTT indicative of diabetes or impaired glucose tolerance.

4. Any history of a MI or clinically significant, active, cardiovascular history including a history of arrhythmia's or conduction delays on ECG, unstable angina, or decompensated heart failure.

5. Any laboratory values: AST > 2x ULN; ALT > 2x ULN TSH > 6 mU/l

6. Current addiction to alcohol or substances of abuse as determined by the investigator.

7. Mental incapacity, unwillingness or language barrier precluding adequate understanding or cooperation

8. Taking any prescription or non-prescription medications at the time of the study

9. Having donated blood three months prior to and three months post study procedures

10. A pregnancy test will be performed 1 to 3 days prior to each study in all female subjects. Those who test positive for pregnancy will be excluded.

11. No clinical evidence of neoplasms which have been known to overexpress GLP-1 receptors i.e. pheochromocytomas, brain tumors and embryonic tumors.

12. Hypersensitivity to egg-, soya-,or peanut protein or previous allergy to intralipid

13. Those with known sensitivity to metoclopramide

Study Design

Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Single Group Assignment, Masking: Single Blind (Subject), Primary Purpose: Basic Science

Related Conditions & MeSH terms

• Hyperlipidemia
• Hyperlipidemias

Intervention

Drug:
• exenatide
In each study, the subjects will receive s.c. injection of either exenatide or matched placebo, in the Metabolic Testing Center and 2 hours prior to the start of the lipoprotein turnover study. Subjects will be blinded with regard to the treatments.

Locations

Country	Name	City	State
Canada	Toronto General Hospital	Toronto	Ontario

Sponsors (2)

Lead Sponsor	Collaborator
University Health Network, Toronto	Eli Lilly and Company

Country where clinical trial is conducted

Canada, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	The objective is to examine the change in apoB48 production rate after one subcutaneous injection of exenatide, under conditions of a pancreatic clamp and a steady state fed state.		over 10 hours	No
Secondary	The secondary objective is to examine the change in apoB100 production rate in the same conditions, and the secondary measure is the difference between exenatide and placebo in the mean production of TRL-apoB100		over 10 hours	No